Passing "non-port" data from gui to plugin

[f00bar]

I would like to make it possible to update gate patterns from the UI. Either from a built in pattern editor (Think tr-909 or tb-303), or from an external file. I guess I need to expose my internal sequence buffer to the host, but how could I do that when the buffer contains data that the host does not understand. The data is currently an array of Event objects

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struct Event
    {
    uint64_t time; /*<This time is absolute*/
    uint64_t type;
    union
        {
        uint8_t bytes[16];
        uint16_t words[8];
        uint32_t dwords[4];
        uint64_t qwords[2];
        } data;
    };

[f00bar]

In manifest?

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        [
	a lv2:InputPort,atom:AtomPort;
	lv2:index 25;
	lv2:symbol "pattern";
	lv2:name "pattern";
	atom:bufferType atom:Chunk;
	]